Combine the dry ingredients in a large bowl. Set aside.

In another, whisk together the butter, brown sugar, and maple syrup. Add the eggs and vanilla.

Whisk until combined.

Pour the wet into the dry. Stir until combined.

Stir in the pecan pieces.

Spread into a 9×13 pan that has been coated with cooking spray. Bake in a preheated 350 degree oven for 20 minutes, or until a toothpick comes out clean.

Sprinkle with powdered sugar.